Pāṇini sūtras

The lengthening of the penultimate vowel of a stem ending in n, before the affixes of the strong-case, is optional in the Veda, when ṣ precedes such a vowel.

German Geht dem Vocal ein ṣ voran, so ist im Veda die Verlängerung nicht nothwendig. (9)

1. vāवा

   Part	Lexeme	Sandhi form	Meaning	Stem
   vव्	vāवा	vāवा	optionally	vāवा

2. ṣa+pūrvasyaष+पूर्वस्य

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   ṣष्	ṣaष	ṣaष	ṣakāraषकार	ṣष् + plus aअ
   pप्	pūrvaपूर्व	pūrvasyaपूर्वस्य	antecedent	pūrvaपूर्व + plus syaस्य

3. nigameनिगमे

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   nन्	nigamaनिगम	nigameनिगमे	Veda	nigamनिगम् + plus eए

Anuvṛtti

1. na+upadhāyāḥन+उपधायाः 6·4·7

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   nन्	naन	naन	nakāraनकार	nन् + plus aअ
   uउ	upadhāउपधा	upadhāyāḥउपधायाः	penult	upadhउपध् + plus āyआय्

2. a+sambuddhauअ+सम्बुद्धौ 6·4·8

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	aअ	aअ	not	aअ
   sस्	sambuddhiसम्बुद्धि	sambuddhauसम्बुद्धौ	vocative	sambuddhसम्बुद्ध् + plus auऔ